Numbers whose set of base-5 digits is {1,4}.

Terms

a(0) =1a(1) =4a(2) =6a(3) =9a(4) =21a(5) =24a(6) =31a(7) =34a(8) =46a(9) =49a(10) =106a(11) =109a(12) =121a(13) =124a(14) =156a(15) =159a(16) =171a(17) =174a(18) =231a(19) =234a(20) =246a(21) =249a(22) =531a(23) =534a(24) =546a(25) =549a(26) =606a(27) =609a(28) =621a(29) =624